I personally believe that such extreme measures would have produced benefits many years ago. By following them with a new Chevy six in the fifties, you could have stretched the engine life from it's normal 50,000 mile life to maybe 60,000 miles.<g>
With modern engines, however, I believe that as long as you don't lug it, during the break in period, and don't let it run for extended intervals at a constant speed, your engine will live a long useful life.
The text from the book referred to above about keeping a constant light load, is probably the best part of the advice.
Having said that, it never hurts to be extreme. Most people think my oil change methods/intervals are extreme. But they would have a tough time proving that they hurt anything.
By taking extreme measures during break in, it may be healthy for your peace of mind.
Enjoy your new 240D,